Chain.



H. HOWSON.

CHAIN.

APPLICATION FILED MAR. 28, 1912.

1 1 1 5,43 1, Patented 0013.27, 1914.

means for retaining the trrnn sr rns rarnn r over-o.

,HENB-Y HOWSON, OF PI IILADELPHI'A,PENN$ELVANI ,..-ASSIGNOR1T0 LXNKvBELT COMPANY, OF CHICAGO, ILLINOIS; A CQRRORATION' OF...ILLIINOIS.

CHAIN.

I ,1 I5 ,4l31l p'Application filed March 28,

To all whom it may concern:

BQ-jl'fmkhOWIl that I, HENRY Howson a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in: Chains, of which the following is a specification.

This invention relates to certain improvements in chains, particularly. in drive chains of the type made of a series of plates and having pivot pins which are free to rotate in the links.

Une object of the invention is to provide pivot pins in the plates without the use of devices which would project beyon the sides of the chain.

A further object of the invention is to form the chains so that the clips, which retain the plates of each link, do not extend beyond the sides of the chain.

In the accompanying drawings :-F1gure 1, is a sectional plan view on the line 1-- 1, Fig. 2, illustrating my improved chain; Fig. 2, is a side view of s'uficient of a chain to illustrate my invention; Fig. 3, is a transverse sectional view on the line 33, Fig. 2; Fig. 4;, is a transverse sectional view on the line 4-4:, Fig. 2; Fig. 5, is a perspective view of one of the side link plates; and Fig. 6, is a erspective view of one of the pivot pins.

eferring to the drawing, A and B are the links of a chain. The links A are composed of plates 0., a and the links B are composed of plates 1;, b. The lates a, a of the links A have teeth a and t e plates 6, b of the links B have teeth a.

D, D are the pivot pins, which ass through openings in the plates of the links A and B and these links have extended bearings for the pivot pins and also have extended bearings at the teeth for the teeth of the sprocket wheels around which they ass, but I lay no claim to the extended hearings of the pivot pins or the extended bearings of the teeth.

Heretofore it has been the practice in this type of chains to have the pivot pins of an even diameter throughout, and to provide means for retaining the pivot pins against longitudinal movement in the links, but this necessitated a projection on the chain beyond the ends of the pivot pins.

By my invention the diameter of the pivot in is reduced at each end d, as shown in ig. 1, forming shoulders d, as clearly shown in Fig. 6. The openings in the link Specification of Letters Patent ,llatentedl Oct. 2'3, 1914i.

1912 definite-686,805.

plates (2 and b are of such a diameter that the body portion of the link D will snugly tit therein 'while the link plates aand b at each side of the chain are of such a diameter as: to snugly fit thereduced portions (.5

of the pin D. The link plates 6 and the 6K- tended bearing a of the plates a rest against the shoulders (IV-of the pivot pinpzthus re-- taining the pivot pin against longitudinal movement in the links, yet allowing the pins to freelyturn.

In order to hold the plates of each link in position, I provide clips which extend through openings between the teeth of the links and which plates. I lay no claim broadly to the location of the clips at this point, nor to the form of the clips.

I, I are the clips which retain the plates a, a of the link A in place, and the outside plates a are recessed at f to receive the end The plates are prefsections 2' of the clips. erably perforated at f to receive the projection i of the clip. The depression 1 is such that the clip does not extend beyond the face of the side plate a, as clearly shown in Figs. 1 and 4:.

I, I are'the clips which secure the plates 6, b of the link B in place. The outside plates 2; of the links B need not be recessed as the plates (1 of the links A protect them.

In some instances, the clips I may be dis-- pensed with as the clips I, secured to the alternate links, will hold the plates of the links B laterally in position. Thus it will be seen by the above construction that there is no projection beyond the link plates a of the chain. Consequently, there .is no lateral wear except on'the side link plates a, a.

It will be understood that the links A and B may be composed of any number of plates at and 6, according to the width of the chain desired.

While I have illustrated the invention as applied to a chain having teeth; these teeth may be modified or dispensed with entirely in some instances. The invention may also be used in connection with a chain in which extended bearings are omitted.

I claim 1. The combination of a series of sets of toothed plates, each set forming the link of a chain; each plate having two openings spaced apart; pivot pins mounted in the bear upon the outside link openings and coupling the links together; no

' each plate having two the pivot pins being reduced at each end to form shoulders; the outside plates of each link having openings less in diameter than those at the center of the links so as to fit the reduced portions of the pivot pins; the outside plates of each alternate link bein recessed; and clips extending through the space between the teeth of said link and having portions extending into the recesses,

' whereby the plates are held together and the outer surface of the lip is flush with the outer surface of the outside plates.

2. The combination of a series of sets of 'plates, each set forming the link of a chain; openings; pivot pins extending through the openings and con- In testimony whereof, I have signed my 25 name to this specification, in the presence of two subscnblng witnesses.

HENRY HOWSON.

Witnesses:

WM. E. SHUPE, WM. A. BARR. 

